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如图,在正点电荷Q的电场中有M、N、P、F四点,M、N、P为直角三角形的三个顶点,F为MN的中点,∠M=30°,M、N、P、F四点的电势分别用φM、φN、φP、φF表示。已知φM=φN,φP=φF,点...
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无限大接地金属板竖直放置与金属板O.点为面中心相距为d的某点处放有一电量为q的正点电荷它们之间的电场
E
M
>E
N
E
M
=E
N
E
M
N
无法确定
如图所示Q1Q2为两个等量同种正点电荷在Q1Q2产生的电场中有M.N.和O.三点其中M.和O.在Q1
O点电势一定高于N.点电势
O点场强一定小于M.点场强
将一个负点电荷从M.点移到N.点,需克服电场力做功
若将一个正点电荷分别放在M.、N.和O.三点,则该点电荷在O.点时电势能最大
如图所示Q.1Q.2为二个等量同种的正点电荷在二者的电场中有M.N.和O.三点其中M.和O.在Q.1
在Q.
1
、Q.
2
连线的中垂线位置可以画出一条电场线
若将一个正点电荷分别放在M.、N.和O.三点,则该点电荷在M.点时的电势能最大
若O.N.间的电势差为U.,ON间的距离为d, 则N.点的场强为
若O.N.间的电势差为U.,将一个带电量为q的负点电荷 从N.点移到O.点,则克服电场力做功为Uq
M点的场强小于N点的场强
O点的电势等于Q点的电势
将一负点电荷由M点移到Q点,电荷的电势能增加
一正点电荷只受电场力作用能从Q点沿圆周运动至N点
如图所示真空中有一个固定的点电荷电荷量为+Q图中的虚线表示该点电荷形成的电场中的等势面有两个一价离子
M.是正离子,N.是负离子
a→p→b过程中电场力先做负功再做正功
M.在b点的速率大于N.在c的速率
M.从p→b过程中电势能的增量小于N.从a→q电势能的增量
如图所示空间中存在着由一固定的正点电荷Q图中未画出产生的电场另一正点电荷q仅在电场力作用下沿曲线M.
Q.一定在虚线MP上方
M.点的电势比N.点的电势高
q在M.点的电势能比在N.点的电势能小
q在M.点的加速度比在N.点的加速度大
如图所示真空中有一个固定的点电荷电荷量为+Q..图中的虚线表示该点电荷形成的电场中的四个等势面有两个
M.一定是正离子,N.一定是负离子.
M.在p点的速率一定大于N.在q点的速率.
M.在b点的速率一定大于N.在c点的速率.
M.从p→b过程电势能的增量一定小于N.从a→q电势能的增量。
如图所示Q1Q2为二个等量同种的正点电荷在Q1Q2产生的电场中有M.N.和O.三点其中M.和O.在Q
在Q1、Q2连线的中垂线位置可以画出一条电场线
若将一个正点电荷分别放在M.、N.和O.三点,则该点电荷在M.点时电势能最大
若ON间的电势差为U.,ON间的距离为d,则N.点的场强为
若ON间的电势差为U,将一个带电量为g的负点电荷从N.点移到O.点,需克服电场力做功qU
如图所示固定在Q.点的正点电荷的电场中有M.N.两点已知<下列叙述正确的是
若把一正的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一正的点电荷从M.点沿直线移到N.点,则该电荷克服电场力做功,电势能增加
若把一负的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一负的点电荷从M.点沿直线移到N.点,再从N.点沿不同路径移回到M.点,则该电荷克服电场力做的功等于电场力对该电荷所做的动,电势能不变
如图在正点电荷Q.的电场中有M.N.P.F.四点M.N.P.为直角三角形的三个顶点F.为MN的中点∠
点电荷Q.一定在MP的连线上
连接PF的线段一定在同一等势面上
将正试探电荷从P.点搬运到N.点,电场力做负功
φ
P
大于φ
M
如图所示固定在Q.点的正点电荷的电场中有M.N.两点已知<下列叙述正确的是
若把一正的点电荷从M.点沿直线移到N.点,则电场力对该电荷 做正功,电势能减少
若把一正的点电荷从M.点沿直线移到N.点,则该电荷克服电场 力做负功,电势能增加
若把一负的点电荷从M.点沿直线移到N.点,则电场力对该电荷做负功,电势能减少
若把一负的点电荷从M.点沿直线移到N.点,再从N.点沿不同路径移回到M.点,则该电荷克服电场力做的功等于电场力对该电荷所做的功,电势能不变
如图所示固定在Q.点的正点电荷的电场中有M.N.两点已知<下列叙述正确的是
若把一正的点电荷从M.点沿直线移到N.点,则电场力对该电荷 做正功,电势能减少
若把一正的点电荷从M.点沿直线移到N.点,则该电荷克服电场 力做负功,电势能增加
若把一负的点电荷从M.点沿直线移到N.点,则电场力对该电荷做负功,电势能减少
若把一负的点电荷从M.点沿直线移到N.点,再从N.点沿不同路径移回到M.点,则该电荷克服电场力做的功等于电场力对该电荷所做的功,电势能不变
如图在正点电荷Q.形成的电场中在某点M.放入一电荷量为q的正点电荷P.P.受到的库仑力为F.下列表述
P.、Q.之间相互吸引
若将P.移走,则M.点的电场强度为零
若将P.移近Q.,则P.所受库仑力减小
若将P.的电荷量增大为2q,则P.所受库仑力增大为2F.
如图所示在点电荷Q.的电场中有A.B.两点将一个带电荷量为q=1×10-9C的正点电荷放在A.时不影
将电量为q=1×10-18C的检验电荷放入正点电荷+Q产生的电场中的P.点时它受到的电场力为4×10
如图所示某点电荷产生的电场中电场线上有M.N.两点.在M.点静止释放一个电荷量大小为4.0×10-6
如图所示固定在Q.点的正点电荷的电场中有M.N.两点已知<下列叙述正确的是
若把一正的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一正的点电荷从M.点沿直线移到N.点,则该电荷克服电场力做功,电势能增加
若把一负的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一负的点电荷从M.点沿直线移到N.点,再从N.点沿不同路径移回到M.点,则该电荷克服电场力做的功等于电场力对该电荷所做的动,电势能不变
如图
B.C.D.所示是四种电场的电场线,,图A.是等量正点电荷电场,M.、N.是两电荷连线 上关于中点对称的两点,图
是等量异种点电荷电场,M.、N.是两电荷连线中垂线上关于中点对称的两点,图
是带有等量异种电荷的平行金属板之间的电场,M.、N.是电场中不在同一水平面上的任意两点,图
是正点电荷与带负电的金属板形成的电场,M.、N.是金属板表面上关于中点对称的两点。图A.B.C.D.中,哪个图形中M.、N.处电场强度相同、电势电相等?
如图所示真空中有一个固定的点电荷电荷量为+Q..图中的虚线表示该点电荷形成的电场中的四个等势面.有两
只有①③
只有②④
只有①④
只有②③
如图所示固定在Q.点的正点电荷的电场中有M.N.两点已知<下列叙述正确的是
若把一正的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一正的点电荷从M.点沿直线移到N.点,则该电荷克服电场力做功,电势能增加
若把一负的点电荷从M.点沿直线移到N.点,则电场力对该电荷做功,电势能减少
若把一负的点电荷从M.点沿直线移到N.点,再从N.点沿不同路径移回到M.点,则该电荷克服电场力做的功等于电场力对该电荷所做的动,电势能不变
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E Womenarefriendly.ButmenaremorecompetitiveWhyResearchershavefoundit’salldowntothehormoneoxytocin荷尔蒙催生素.Althoughknownasthelovehormoneitaffectsthesexesdifferently. Womentendtobesocialintheirbehavior.TheyoftensharewithothersButmentendtobecompetitiveTheyaretryingtoimprovetheirsocialstatussaidProfessorRyan. Generallypeoplebelievethatthehormoneexytocinisletoutinourbodyinvarioussocialsituationsandourbodycreatesalargeamountofitduringpositivesocialinteraction互动suchasfallinginloveorgivingbirth. ButinapreviousexperimentProfessorRyanfoundthatthehormoneisalsoletoutinourbodyduringnegativesocialinteractionssuchasenvy. Furtherresearchesshowedthatinmenthehormoneoxytocinimprovestheabilitytorecognizecompetitiverelationshipsbutinwomenitraisestheabilitytorecognizefriendship. ProfessorRyan’srecentexperimentused62menandwomenaged20to37. Halfoftheparticipants参与者receivedoxytocin.Theotherhalfreceivedplacebo安慰剂. Afteraweekthetwogroupsswitchedwithparticipants.Theywentthroughthesameprocedurewiththeothermaterial. Followingeachtreatmenttheywereshownsomevideopictureswithdifferentsocialinteractions.Thentheywereaskedtoanalyzetherelationshipsbyansweringsomequestions.Thequestionswereabouttellingfriendshipfromcompetition.Andtheiranswersshouldbebasedongesturesbodylanguageandfacialexpressions. Theresultsindicatedthataftertreatmentwithoxytocinmen’sabilitytocorrectlyrecognizecompetitiverelationshipsimprovedbutinwomenitwastheabilitytocorrectlyrecognizefriendshipthatgotbetter. ProfessorRyanthusconcluded:Ourexperimentprovesthatthehormoneoxytocincanraisepeople’sabilitiestobetterdistinguishdifferentsocialinteractions.Andthebehaviordifferencesbetweenmenandwomenarecausedbybiologicalfactor因素thataremainlyhormonal. Theauthordevelopsthetextby_______.
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阅读下面短文并用英语回答问题请注意题后的词数要求 Whenmyfatherwascelebratingamilestone里程碑birthdayIpulledtogetherasurprisegifttreathewouldneverforget. Ashewasapproaching60Ihadafunidea:WhatifIcouldgetthememoriespeoplehadofhimputeachoneintoanenvelope—60intotal—andhavehimopenthemonebyoneonhisbirthdaySoIwroteane-mailtofamilyandfriendsexplainingmyidea. Isentthee-mailandwaited.AndthentherepliesstartedcominginandIwasveryverysurprised.Thereweresomanymemoriesandtheywereallsolovely.Theycamefromthe’50s’60s’70sfromeverydecade十年betweennowandthedaymydadwasborn.Theycamefrommymothermysiblingsmygrandmamydad’sfriendsfromhighschoolhissistermydad’sfirstbossacolleagueathisfirstjobfrompeoplewhohadn’tseenmydadin40yearsfrompeopleImyselfhadn’teveninformed.Theytypedthemandhandwrotethem.Theymailedthemande-mailedthem. ThenightbeforeDad’sbirthdaymysisterandIstayeduplateputtingeverythingtogetherwithsomeenvelopes. Thenextmorningafterbreakfastandpresentsandcakewegavethepileofenvelopestohim.Justonemorethingforyouwesaid. Ittookhimalongtimetoopenthemandread.Eachonewasabrieftickettoanothertimealeap跳跃backwardoveryearsanddecades.Therewasalotoflaughterandafewtearstoo. Iwaskindofsadwhentheprojectwasoverbecauseitwasgreatfuntocollectthesememories.Itgavemeadifferentpictureofdad. Whosentthemailsnomorethan6words
下面短文中有10处语言错误请在有错误的地方增加删除或修改某个单词 注意 1.每句不超过两个错误 2.每处错误及修改均仅限一词 3.只允许修改10处多者从第11处起不计分 Helloboysandgirls!TodayIamgoingtotalkwithwhatyoushoulddowhenafirealarmgooff.Ifyouhearthealarmstandinlineatthedoorandwaityourteachertoleadyououtside.Stayclosetoyourteacherandclassmate.Don’tpanicorgetoutoflineandtryingtoremainquietandcalmly.Soonthefirefighterswillcomeandputoutafire.Ifit’safalsealarmandthereisnofireyourteacherwillleadusbacktotheclassroom.Ifyounoticethatwhensomeoneismissingandhurttellyourteacherimmediately.
图3为我国某区域冬季某日8时至次日8时的降雪量和积雪深度分布图该时段该区域风向主要为偏东风云量分布差异不明显完成5~7题 造成该区域东西部积雪深度差异的主要因素是
图2为某个组团式城市布局图各城区分散布局完成3~4题 该城市的布局模式有利于
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